EP4233776A2 - Pièce à main dentaire - Google Patents

Pièce à main dentaire Download PDF

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Publication number
EP4233776A2
EP4233776A2 EP23179862.0A EP23179862A EP4233776A2 EP 4233776 A2 EP4233776 A2 EP 4233776A2 EP 23179862 A EP23179862 A EP 23179862A EP 4233776 A2 EP4233776 A2 EP 4233776A2
Authority
EP
European Patent Office
Prior art keywords
bearing
barrel
central shaft
dental handpiece
bearing seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23179862.0A
Other languages
German (de)
English (en)
Other versions
EP4233776A3 (fr
Inventor
Hua Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beyes Dental Canada Inc
Original Assignee
Beyes Dental Canada Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beyes Dental Canada Inc filed Critical Beyes Dental Canada Inc
Publication of EP4233776A2 publication Critical patent/EP4233776A2/fr
Publication of EP4233776A3 publication Critical patent/EP4233776A3/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
    • A61C1/142—Operating tool blocking means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
    • A61C1/057—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive with means for preventing suction effect in turbine after deactivation of the drive air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
    • A61C1/052—Ducts for supplying driving or cooling fluid, e.g. air, water
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/12—Angle hand-pieces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
    • A61C1/141—Tool-holders, i.e. operating tool holders, e.g. burr holders in an angled handpiece
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
    • A61C1/145—Instruments or accessories for tool holders

Definitions

  • the present invention relates to the technical field of medical devices, in particular to a dental handpiece.
  • a dental turbine handpiece includes a barrel with an air turbine received therein.
  • the air turbine is blown by compressed air to rotate within the barrel and generate power.
  • the air turbine is attached around a central shaft, and a dental tool, such as a bur, is mounted at one end of the central shaft that extends out of the barrel.
  • the rotating air turbine drives rotation of the central shaft, which in turn drives the bur to rotate.
  • their central shafts are driven by the air turbines to rotate at a speed up to 300,000 to 400,000 RPM.
  • a dental handpiece that can effectively prevent suck-back after shutdown is provided.
  • a dental handpiece in one aspect, includes a barrel, an air turbine, a central shaft, a bearing, and a seal.
  • the barrel defines an accommodating cavity therein and includes an axial open end in communication with the accommodating cavity.
  • the air turbine is rotatably arranged in the accommodating cavity of the barrel.
  • the central shaft is secured to the air turbine to rotate with the air turbine.
  • the bearing is mounted in the barrel adjacent the axial open end of the barrel and supporting the central shaft for rotation.
  • the seal is trumpet-shaped and includes a sealing portion sleeved over an outer cylindrical surface of the central shaft and a mounting portion surrounding the sealing portion, the mounting portion being arranged and flattened between the open end of the barrel and the bearing.
  • a bearing seat is provided in the barrel, the bearing seat is formed with a bearing hole and an annular groove at an axial end of the bearing seat facing the air turbine, the bearing is disposed in the bearing hole, the mounting portion is received in the annular groove and sandwiched between the bearing and the bearing seat.
  • a depth of the annular groove in an axial direction of the barrel is smaller than a thickness of the mounting portion in the natural state.
  • the mounting portion has a circular or elliptical cross section
  • the annular groove has a square or rectangular cross section
  • a flat gasket is provided between an axial end of the bearing and the bearing seat, and the mounting portion is sandwiched between the flat gasket and the bearing seat.
  • the aforementioned bearing is a first bearing
  • the aforementioned bearing seating is a first bearing seat
  • the dental handpiece further comprises a second bearing and a second bearing seat
  • the first bearing and the second bearing are respectively arranged at opposite axial sides of the air turbine
  • the first bearing is disposed in the first bearing seat and close to the open end of the barrel while the second bearing is disposed in the second bearing seat and away from the open end of the barrel
  • an elastic member is provided between an axial end of the second bearing and the second bearing seat.
  • an outer edge of a front end of the first bearing seat and an inner edge of the front end of the barrel form matching steps, which axially abut against each other to form a limiting arrangement.
  • an outer wall surface of the second bearing seat and an inner wall surface of the rear end of the barrel form matching threads, which are screwed and fixed to each other.
  • inner rings of the first bearing and second bearing clamp the air turbine, and the elastic member is compressed and deformed to generate a forward pre-tightening force, which acts on the seal via the second bearing, the air turbine, the first bearing and the flat gasket, such that the seal is clamped and flattened.
  • the sealing portion is deformable to separate from the outer cylindrical surface of the central shaft or closely contact the outer cylindrical surface of the central shaft depending on a pressure difference between interior and exterior of the barrel.
  • the seal is an elastic component with a Shore A hardness of 50-70 degrees.
  • the sealing portion extends from an inner edge of the mounting portion radially inward and axially toward the open end of the barrel.
  • a radially inner side surface of the sealing portion defines a through hole at a center of the sealing portion, the central shaft passes through the through hole, the radially inner side surface is a cylindrical surface, and the cylindrical surface is in close contact with the outer cylindrical surface of the central shaft when the dental handpiece is shutdown.
  • the mounting portion having a greater thickness along an axial direction of the barrel than the sealing portion; wherein, along the axial direction of the barrel, the mounting portion has a thickness of 0.4-1.0 mm while the sealing portion has a thickness of 0.1-0.3mm.
  • the dental handpiece includes a handle connected to the barrel, a main air passage and an exhaust passage are formed in the handle corresponding to the air turbine, and both the main air passage and the exhaust passage are communicated with the accommodating cavity for inflow and outflow of compressed air, respectively.
  • the dental handpiece of the present application includes a seal that can expand outwardly or contract inwardly by corresponding deformation of the seal under the action of a pressure difference between interior and exterior of the barrel, such that during operation, the seal is separated from the central shaft to facilitate the rotation of the central shaft, and after shutdown, the seal and the central shaft closely contact each other to form a good braking and sealing effect, thereby preventing foreign matters from being sucked back into the barrel.
  • This ensures the safety and service life of the bearing, and on the other hand avoids cross-infection among patients.
  • a dental handpiece includes a head 10 and a handle 30 connected to the head 10.
  • the handle 30 is convenient for users, such as a dentist, to hold.
  • the head 10 includes a barrel 11 to which the handle 30 is connected, an air turbine 12 rotatably provided in the barrel 11, a central shaft 13 secured to the air turbine 12, a bearing 14 supporting the central shaft 13 for rotation, and a seal 20.
  • the barrel 11 generally has a hollow cylindrical structure, and is formed with an accommodating cavity 110 therein for installing the air turbine 12. Opposite axial ends (i.e. front and rear ends) of the barrel 11 are formed with openings respectively, and a rear cover 15 is provided at a rear end of the barrel 11.
  • the central shaft 13 is fixedly inserted through a center of the air turbine 12, and its front and rear ends each extend out of the air turbine 12.
  • the rear end of the central shaft 13 is rotatably supported at the center of the rear cover 15, and the front end thereof extends out of the barrel 11 through the opening located at the front end of the barrel 11.
  • a medical tool such as a bur 40 is connected to the front end of the central shaft 13.
  • a main air passage 32 and an exhaust passage 34 are formed in the handle 30, and both the main air passage 32 and the exhaust passage 34 are communicated with the accommodating cavity 110 for inflow and outflow of compressed air, respectively.
  • the compressed air is delivered into the accommodating cavity 110 through the main air passage 32 to drive the air turbine 12 to rotate at a high speed, thereby driving the central shaft 13 to rotate, which in turn drives the medical tool, such as the bur 40, to grind teeth.
  • the central shaft 13 may rotate at a speed up to 300,000 to 400,000 RPM.
  • the compressed air flows along wall surfaces of the accommodating cavity 110 to drive the air turbine 12 to rotate, and finally flows out of the accommodating cavity 110 through the exhaust passage 34.
  • a circumferentially limiting arrangement may be formed between the air turbine 12 and the central shaft 13 by means of keying, snapping, etc., such that the air turbine 12 and the central shaft 13 can rotate synchronously under the driving of the compressed air.
  • first bearing 14a and a second bearing 14b Two bearings 14 are provided, which are referred to as a first bearing 14a and a second bearing 14b hereinafter for ease of description.
  • the first bearing 14a and the second bearing 14b are respectively sleeved over the front end and rear end of the central shaft 13, and are respectively located on the front and rear sides of the air turbine 12 in the axial direction, to ensure balance and stability of the rotation of the air turbine 12 and the central shaft 13, thereby reducing the generation of noise.
  • both the first and second bearings 14a, 14b are ball bearings, which form rolling friction during the rotation of the central shaft 13, thereby effectively reducing wear.
  • first and second bearings 14a, 14b may also be sliding bearings, ceramic bearings, etc.; in addition, the first and second bearings 14a, 14b may also be different types of bearings, which are not limited to the specific embodiments described herein.
  • the first bearing 14a is assembled into the barrel 11 via a first bearing seat 16, and the second bearing 14b is assembled into the barrel 11 via a second bearing seat 17.
  • an outer edge of a front end of the first bearing seat 16 and an inner edge of the front end of the barrel 11 form matching steps, which axially abut against each other to form a limiting arrangement;
  • an outer wall surface of the second bearing seat 17 and an inner wall surface of the rear end of the barrel 11 form matching threads, which are screwed and fixed to each other;
  • the rear cover 15 is hooked and connected to an end of the second bearing seat 17.
  • the first bearing seat 16 and/or the second bearing seat 17 may be integrally formed in the barrel 11, or the second bearing seat 17 and the rear cover 15 may be a unitary structure.
  • a first bearing hole is formed at a center of a side of the first bearing seat 16 facing the air turbine 12 for assembling the first bearing 14a.
  • a flat gasket 18 is provided between the first bearing seat 16 and a front axial end of the first bearing 14a.
  • a seal 20 is sleeved over the central shaft 13 and located on the front side of the first bearing 14a, particularly, in this embodiment, sandwiched between the flat gasket 18 and the first bearing seat 16, for providing sealing between the first bearing 14a and the front end of the barrel 11 during the shutdown of the dental handpiece.
  • the flat gasket 18 provided between the first bearing seat 16 and the first bearing 14a may be omitted, and then the seal 20 is sandwiched between the first bearing 14a and the first bearing seat 16.
  • a second bearing hole is formed at a center of the second bearing seat 17 for assembling the second bearing 14b.
  • An elastic member 19, such as an elastic washer, is provided between the second bearing seat 17 and a rear axial end of the second bearing 14b.
  • the first bearing seat 16, the seal 20, the flat gasket 18, the first bearing 14a, the central shaft 13 and the air turbine 12 are sequentially assembled into the barrel 11; the elastic member 19 and the second bearing 14b are assembled into the second bearing seat 17, and then the second bearing seat 17 is screwed to the barrel 11.
  • the seal 20 is made of fluorine rubber, hydrogenated nitrile rubber or other materials, and preferably has a Shore A hardness of 50-70 degrees, which may provide advantages of oil resistance, abrasion resistance and high temperature resistance, and also can be fabricated directly by injection-molding and thus have low production cost.
  • the seal 20 has a Shore A hardness of 60 degrees.
  • the seal 20 generally has a ring shape, and includes a mounting portion 22 located on an outer edge thereof, and a sealing portion 24 located inside the mounting portion 22. A radially inner side surface of the sealing portion 24 defines a through hole 26 at a center of the sealing portion 24, for the central shaft 13 to pass therethrough.
  • the radially inner side surface serves as a working surface 28, and is in close contact with the outer cylindrical surface of the central shaft 13 when the dental handpiece is shutdown.
  • the through hole 26 is a cylindrical hole
  • the working surface 28 is a cylindrical surface.
  • the working surface 28 has a diameter D1 of preferably 2.8-3.0 mm, which is slightly smaller than the diameter of the central shaft 13.
  • the mounting portion 22 may be generally annular with a circular or elliptical cross section, and resembles an O-ring.
  • the cross section of the mounting portion 22 is circular in a natural state, and the circular cross section has a diameter D2 of 0.4-1.0 mm, that is, a thickness of the mounting portion 22 in the axial direction of the barrel 11/central shaft 13 is 0.4-1.0 mm.
  • an annular groove 160 is formed in the first bearing seat 16 at a side of the first bearing seat 16 facing the air turbine 12, for receiving and positioning the mounting portion 22 of the seal 20. As shown in Fig.
  • the annular groove 160 has a square or rectangular cross section, which is different from the cross section of the mounting portion 22 and can provide a space for the deformation of the mounting portion 22.
  • An axial depth of the annular groove 160 is smaller than the thickness D2 of the mounting portion 22 in the natural state.
  • the mounting portion 22 In an assembled state, the mounting portion 22 is sandwiched between the flat gasket 18 and the first bearing seat 16 and is flattened, such that the mounting portion 22 has a roughly elliptical cross section, as shown in dashed lines in Fig. 3 . After being flattened, the mounting portion 22 has a thickness D3 equivalent to the axial depth of the annular groove 160, and thus has a difference of 0.05-0.1 mm from its original thickness D2.
  • the sealing portion 24 is generally trumpet-shaped, and extends radially inward from the inner edge of the mounting portion 22 and axially toward the front end of the barrel 11.
  • the sealing portion 24 is tapered from back to front in the axial direction of the seal 20.
  • the thickness of the sealing portion 24 in the axial direction of the barrel 11 is smaller than the diameter of the mounting portion 22, so that the sealing portion 24 may have better elastic deformation ability while the mounting portion 22 may be fixed better.
  • the thickness T of the sealing portion 24 in the axial direction of the barrel 11/the central shaft 13 is 0.1-0.3 mm.
  • the sealing portion 24 is a curved structure arched toward the central shaft 13, which corresponds to an arc surface radius R of 1-3 mm.
  • the working surface 28 of the sealing portion 24 closely contacts the outer cylindrical surface of the central shaft 13. Since the diameter of the working surface 28 is slightly smaller than that of the central shaft 13, the seal 20 may generate elastic deformation when the seal 20 and the central shaft 13 are assembled. In the assembled state, the working surface 28 of the seal 20 closely contacts the outer cylindrical surface of the central shaft 13. The close contact between the working surface 28 and the outer cylindrical surface of the central shaft 13 form a seamless connection therebetween, which isolates the components inside the barrel 11, especially the first bearing 14a and the second bearing 14b, from the outside, and ensures cleanness of the components inside the barrel 11.
  • the outer cylindrical surface of the central shaft 13 mentioned in the present application refers to an outer circumferential wall surface of the central shaft 13, which is different from an axial end surface or a chamfered surface of the central shaft 13, and generally has a cylindrical shape.
  • the outer circumferential wall surface of the central shaft 13 may be formed with any small notch and other structure, that is, the outer cylindrical surface of the central shaft 13 mentioned in the present invention is not limited to a complete cylindrical surface.
  • the central shaft 13 is braked so as to quickly stop rotating.
  • the shaft 13 can stop rotating within 2 seconds after shutdown.
  • a sufficiently strong force is provided to prevent foreign matters, including blood, impurities, debris, etc., from entering the barrel 11, that is, to avoid the damage to the internal components, particularly the bearings 14a and 14b, and also avoid cross-infection among patients.
  • the present invention provides a seal 20 which may correspondingly deform, i.e., expand outwards or contracts inward, under the action of the internal and external pressure difference, so that during operation, the seal 20 separates from the central shaft 13 to facilitate the rotation of the central shaft 13, and during shutdown, the seal 20 tightly wraps around the central shaft 13 to form a good braking and sealing effect so as to prevent foreign matters from entering the barrel 11.
  • the sealing portion 24 of the seal 20 is less in thickness relative to the mounting portion 22 thereof, so that the relatively thicker mounting portion 22 has a sufficient thickness to allow for deformation under pressure during assembly, thereby providing a good seal at the mounting position of the seal 20 and further enhancing overall sealing effect.
  • the sealing portion 24 is a curved structure arched toward the central shaft 13, and once deformed under a force, the curved structure has a deformation direction consistent with a bending direction of the inner edge of the sealing portion 24, so that the deformation is easier and the effect is better.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP23179862.0A 2020-08-07 2021-08-05 Pièce à main dentaire Pending EP4233776A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010791147.2A CN111904624A (zh) 2020-08-07 2020-08-07 一种牙科手机
EP21189972.9A EP3949893B1 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP21189972.9A Division EP3949893B1 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire
EP21189972.9A Division-Into EP3949893B1 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire

Publications (2)

Publication Number Publication Date
EP4233776A2 true EP4233776A2 (fr) 2023-08-30
EP4233776A3 EP4233776A3 (fr) 2023-10-11

Family

ID=73284703

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21189972.9A Active EP3949893B1 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire
EP23179862.0A Pending EP4233776A3 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP21189972.9A Active EP3949893B1 (fr) 2020-08-07 2021-08-05 Pièce à main dentaire

Country Status (8)

Country Link
US (1) US20220039913A1 (fr)
EP (2) EP3949893B1 (fr)
JP (1) JP7251826B2 (fr)
KR (1) KR102575761B1 (fr)
CN (1) CN111904624A (fr)
ES (1) ES2956540T3 (fr)
PL (1) PL3949893T3 (fr)
TW (1) TWI769045B (fr)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3853632D1 (de) * 1988-12-19 1995-05-24 Matsutani Seisakusho Zahnärztliches Fräswerkzeug und Handstück.
JP3795722B2 (ja) * 2000-01-27 2006-07-12 株式会社モリタ製作所 医療用切削器械及び医療用切削器械用シール部材
CN1887237B (zh) * 2006-07-25 2010-08-18 北京诺士宝牙科手机有限公司 一次性使用高速涡轮牙钻手机防回吸装置
JP5638786B2 (ja) * 2009-03-06 2014-12-10 株式会社ナカニシ 歯科用ハンドピースヘッドの止水構造
US10064698B2 (en) * 2010-05-26 2018-09-04 Zhengzhou Zezheng Technical Services Ltd. Dental drill head
CN102448401B (zh) * 2010-05-26 2014-02-26 郑州泽正技术服务有限公司 齿科涡轮手持钻
WO2012039329A1 (fr) * 2010-09-22 2012-03-29 株式会社吉田製作所 Pièce à main à turbine à air
JP5752999B2 (ja) 2011-06-01 2015-07-22 株式会社ナカニシ 歯科用ハンドピース
JP6403610B2 (ja) 2015-03-02 2018-10-10 株式会社トクヤマデンタル 注出器
CN205234664U (zh) * 2015-11-24 2016-05-18 佛山市凯恩牙科器材有限公司 一种防回吸的牙科手机机头
CN105380718B (zh) * 2015-12-21 2018-04-24 咸阳西北医疗器械(集团)有限公司 用于牙科手机的防尘结构
CN207084861U (zh) * 2017-01-10 2018-03-13 咸阳瑞升福诺医疗器械有限公司 高速气涡轮手机
WO2018189229A1 (fr) * 2017-04-11 2018-10-18 W & H Dentalwerk Bürmoos GmbH Palier à roulement et pièce à main médicale ou dentaire, fonctionnant avec un gaz sous pression
CN208864515U (zh) * 2018-04-27 2019-05-17 河南达睿生物科技有限公司 一种防回吸的高速涡轮牙科手机组件

Also Published As

Publication number Publication date
EP4233776A3 (fr) 2023-10-11
TW202206034A (zh) 2022-02-16
US20220039913A1 (en) 2022-02-10
JP2022031255A (ja) 2022-02-18
KR20220018938A (ko) 2022-02-15
KR102575761B1 (ko) 2023-09-06
EP3949893B1 (fr) 2023-07-26
ES2956540T3 (es) 2023-12-22
EP3949893C0 (fr) 2023-07-26
CN111904624A (zh) 2020-11-10
PL3949893T3 (pl) 2023-11-06
JP7251826B2 (ja) 2023-04-04
TWI769045B (zh) 2022-06-21
EP3949893A1 (fr) 2022-02-09

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